--  @testpoint:opengauss关键字admin(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists admin;
create function admin(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function admin;

--关键字带双引号-成功
drop function if exists "admin";
create function "admin"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "admin";

--关键字带单引号-合理报错
drop function if exists 'admin';
create function 'admin'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `admin`;
create function `admin`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/